admit
automatically enter
no I can't think of a single example of anything that opens wider to allow less to enter.
As of now, Universal Studios does not have any promotions or deals that allow kids to enter for free.
Cell membranes only allow certain things to enter the cell. So basically they filter good stuff to come in the cell and don't allow bad stuff to enter. Permeable = allowed to enter Semi-permeable = somethings can enter; some can't Impermeable = nothing can enter
Keyboard
Spiracles
The process the cell must use to allow the protein to enter is rather simple and uncomplicated. The cell uses the process of osmosis and diffusion along a concentration gradient to allow for passage in and out of the cell.
Stomata.
debate
Multicellular Organisms
They allow fuel to enter and exit the cylinders.
Stomata allow carbon dioxide to enter the leaf for photosynthesis, while also allowing oxygen and water vapor to exit the leaf through transpiration.